They need to understand that they can't put too many chemicals down the drains because that will kill all the beneficial bacteria in the tank.

I think if you can't clear the clog with chemicals then yes, you could be cutting into the walls. to keep the cost down figure out where that clog is and then you're just cutting out a portion of pipe and repairing what I imagine is no bigger than a 3'x3' hole in drywall.

I would only use the more toxic chemicals as a last resort and only with special precautions such as a padlock on the attic access to prevent accidental access by the small children or pets.

So major chemicals it is. 

It’s like a light turned on.Rewind a little, I graduated from Rutgers in 2011 and I have been working as a Chemical Engineer/Technical Manager since.

Any previous use of the property involve chemicals, acid or poisons?

For anyone who's worked with Shawn Huss and team at Chemical Bank, do you know what their policies are with transferring title from a personal account to an LLC?

And a few hundred dollars a year chemicals.

As far as making tenants responsible for drains, suspect that could lead to more problems, I had several dump nasty chemicals in drains in the past, that can cause all kinds of problems.           

You'd have to be willing to spend around $700k for bigger buildings or take your $350k budget to harsher neighborhoods and hope for quality tenants.